Perovskia atriplicifolia

Plant type: Deciduous Perennial
Height: 3-4 feet
Cultural Requirements: full sun
Leaves: opposite, petiolate
Disease and Insects: none
Hardiness: zone 5-9
spacing: 24 -36 inches

http://www.waterwiseplants.utah.gov/images/perennials/perovskia_atriplicifolia2.jpg